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Background: Ticks are important vectors of human and animal pathogens. They are considered as main vectors for transmission of many viral, bacterial, rickettsial and parasitical pathogens. The aim of the present study was to find out species diversity of ticks, which infested the domestic ruminants in Zabol County, Eastern Iran in 2012. Methods: Ticks were selected randomly from sheep, goats, cattle and camels. The ticks were collected from the body of infested animals and stored in 70% ethanol, then transported to the laboratory of Zabol University of Medical Sciences. Following examinations under stereomicroscope, ticks were identified using available taxonomic keys. Results: In this study, a total number of 469 adult ticks (381 males and 88 females) were collected. Ticks were classified into 2 genera and 9 species including: Hyalomma dromedarii (17.3%), Hy. schulzei (1.8%), Hy. marginatum (0.5%), Hy. anatolicum excavatum (12.60%), Hy. anatolicum anatolicum (11.2%), Hy. asiaticum asiaticum (11.0%), Rhipicephalus sanguineus (21.2%), Rh. bursa (10.2%) and Rh. turacunis (13.911%). The frequency of genus Hyalomma (54.6%) was higher than Rhipicephalus. Rh. sanguineus was the predominant tick species and accounted for 21.26% of the ticks. The ratio of males was more than the female ticks. Conclusion: Hyalomma and Rhipicephalus species are commonly distributed in the study area. Further investigations are needed to identify the role of above tick species as vectors of pathogenic organisms. [ABSTRACT FROM AUTHOR]